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.FURNAGE FR' STEAM BUIILRS.

JOHN F. MYERS, OF KOKMO, INDIANA.

Letters Patent No. 60,229, dated Decemer 4, 1866. l

'SPECIFICATION- TO ALL WHOMIT IMAY CONCERN:

Be it knownthat I, JOHN F. MYERS, of Kokomo, in the county of Howard,and State of Indiana, have invented a new and useful improvement inFurnaces -for Steam Boilers; and I do hereby declare that the follow ingis a full, clear, and exact description of the same, reference beingyhad to the annexed drawings, `malring a; part of this specication, inwhich Figure 1 is a perspective view, part of the brick-work beingrepresented as broken away to show the interior structure.

Figure 2 is an elevation showing the rear end.

The same letters are employed in both iigures in thc indication ofidenticalparts. l

The object of this invention is 4to sc arrange a furnace for a steamboiler that the heat may be turned away from the boiler, and the boilerbe exposed Yto t'fie action of currents of cold air for` the rapidreduction of pressure and the avoidance of explosions. This purpose Ieffect by the following arrangement of the furnace: i.

Immediately in rear of the grate-bars, at the frontedge of the bridgewall, Iplace a hinged do'or, B, turned by a crank, B. The door is`formedto fit, and when raised to close, the throat of the furnace entirely;when down it lies upon the bridge wall, and does not impede the draughtof the chimney. 4 I also construct doors C in the side of the furnacewall, and likewise' doors E in theend opposite the ue H. In order topermitthe escape of the draught, I form pipes, G, leading from theBre-box into the breaching, `or directly into the stack. .This pipe maybe opened and closed by a Vvalve at I. When the door B is raised thevalve I is opened, and the heat passes directly into the sta-ck; at theSametime, the doors in the wall being opened, the cold air is admittedto the outside of the boiler, and through the doorsfn'the rear a strongblast ivill be carried by thedr'aught of the stack through the internallues of the boiler, thus veryrapidly cooling the w-ater contained in theboiler, and relieving the pressure thereon. L A

What I claim as my invention, and desire' to secure by Letters Patent,is i 1. A furnace fora steam boiler when constructed.- with a door, orvalve, B, for closing the throat of the furnace, and with doors throughthe exterior walls of the furnace for the admission of `cold air to thesurface of the boiler and ues, substantially in the manner and for thepurpose set forth.v

2. In combination with a door, or valve B, as described, I claim thepipes Gf, and valves I, arranged to operate substantially as and for thepurpose set forth. l p

JOHN F. MYERS.`

Witnesses:

J. H. Knorr, TENcE LINDLEY.

